I bought the USB Triple Foot Switch II today. First of all, let me say this is a nice piece of hardware let down by shocking software and support. Windows 7 is six years old and is by now two major versions out of date. You should not be selling software that will not work on anything newer. Three-button mice have been standard for twenty years. Not allowing a binding for the middle mouse button was a ridiculous oversight. That these issues arose in development is forgivable. That you have not fixed them in four years, when they seem to be purely software issues, is not.

With that out of the way, on to the post:

USB Footswitch on Windows 10 64bit - it works

The software supplied on the CD does not work. Not in administrator mode, not with the Microsoft and Logitech mouse software removed[1], not in Windows 7 on VMWare (understandably), and not in wine under Linux. It fails with the "USB HIDKB not connected" error.

Thank you very much for your explanations and links!
Not all users have the "USB HIDKB not connected" issue. It looks that it dependence from the used chip set and/or USB chip set and independence from the operation system (I know from cases under Windows 7 / Windows 8 and Windows 8.1). But the strange is that users with the same hardware (chip set) have different experience with the foot switches.

Thanks I might make use of this in the future!
Is there a way to make it use scroll up/ scroll down feature?
I got footswitch II.
Would be happy if I can make left pedal- left mouse, and the right pedal - scroll down.
As I use the internet a lot, scrolling down is what happens most. Since I don't have the footswitch III wouldn't be able to have scroll down/up at the same time anyway.

I tried both the software that came with it and the alternative software and no luck. The "Pedal Assignment" software claims my foot pedal isn't even installed, but it does the "1, 2, 3" thing in notepad just fine. I'm running windows 10 and it's listed as "HID Keyboard device" under keyboards in Device Manager. Any help would be great.

The foot switch is compatible with Windows 10.
It could be a USB driver conflict when other USB devices are connected during installation. You can disconnect the devices and try again to program USB foot switches.

It can also sometimes logitech software prevent the installation of the foot switch program.

if the foot switch work as 1.2.3 that means it is recognized. You can click button "clean" in the program window to delete the data. After that, click the line in the program, then press the keyboard key you want to save on the foot switch.
Finally, click the "save"